As states, industry and other stakeholders prepare their public comments to U.S. EPA on the agency's proposed existing power plant regulations, how much flexibility has been built into the rule and how much power do states have to either make or break the regulations? During today's OnPoint, Kenneth Kimmell, president of the Union of Concerned Scientists and a former commissioner of the Massachusetts Department of Environmental Protection, discusses the challenges to linking state and federal goals on energy and environment agendas and the role regional trading systems should play in helping states comply with the rule.